Revision 20098 trunk/libraries/libFMap/src/com/iver/cit/gvsig/fmap/tools/ZoomInListenerImpl.java

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ZoomInListenerImpl.java
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/**


  		




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 * Implementaci?n de la interfaz RectangleListener como herramienta para


  		




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 * realizar un zoom m?s.


  		




  
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 * <p>Listener for doing a <i>zoom in</i> operation of the extent of the <code>ViewPort</code> of the associated {@link MapControl MapControl}


  		




  
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 *  object, defining a rectangular area.</p>


  		




  
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 * 


  		




  
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 * <p>If the area defined is smaller than 3 pixels x 3 pixels holds the zoom, otherwise, calculates the new extent <i>r</i>


  		




  
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 *  with this equations:


  		




  
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 *  <code><br>


  		




  
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 *   double factor = 1/MapContext.ZOOMINFACTOR;<br>


  		




  
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 *	 Rectangle2D rect = event.getWorldCoordRect();<br>


  		




  
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 *   Rectangle2D.Double r = new Rectangle2D.Double();<br>


  		




  
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 *   ViewPort vp = mapCtrl.getMapContext().getViewPort();<br>   


  		




  
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 *   double nuevoX = rect.getMaxX() - ((vp.getExtent().getWidth() * factor) / 2.0);<br>


  		




  
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 *   double nuevoY = rect.getMaxY() - ((vp.getExtent().getHeight() * factor) / 2.0);<br>


  		




  
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 *   Rectangle2D.Double r; // This will be the new extent<br>


  		




  
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 *   r.x = nuevoX;<br>


  		




  
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 *   r.y = nuevoY;<br>


  		




  
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 *   r.width = vp.getExtent().getWidth() * factor;<br>


  		




  
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 *   r.height = vp.getExtent().getHeight() * factor;<br>


  		




  
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 *   vp.setExtent(r);


  		




  
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 *  </code>


  		




  
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 * </p>


  		




  
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 * 


  		




  
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 * <p>The ultimately extent will be an adaptation from that, calculated by the <code>ViewPort</code>


  		




  
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 *  bearing in mind the ratio of the available rectangle where display the graphical information.</p>


  		




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 *


  		




  
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 * @see MapContext#ZOOMINFACTOR


  		




  
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 * @see ViewPort#setExtent(Rectangle2D)


  		




  
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 * @see ZoomOutListenerImpl


  		




  
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 * @see ZoomOutRightButtonListener


  		




  
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 *


  		




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 * @author Vicente Caballero Navarro


  		




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 */


  		




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public class ZoomInListenerImpl implements RectangleListener {


  		




  
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	/**


  		




  
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	 * The image to display when the cursor is active.


  		




  
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	 */


  		




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	private final Image izoomin = new ImageIcon(MapControl.class.getResource(


  		




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				"images/ZoomInCursor.gif")).getImage();


  		




  
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	/**


  		




  
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	 * The cursor used to work with this tool listener.


  		




  
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	 * 


  		




  
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	 * @see #getCursor()


  		




  
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	 */


  		




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	private Cursor cur = Toolkit.getDefaultToolkit().createCustomCursor(izoomin,


  		




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			new Point(16, 16), "");


  		




  
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	/**


  		




  
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	 * Reference to the <code>MapControl</code> object that uses.


  		




  
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	 */


  		




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	private MapControl mapCtrl;


  		




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	/**


  		




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	 * Crea un nuevo RectangleListenerImpl.


  		




  
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 	 * <p>Creates a new <code>ZoomInListenerImpl</code> object.</p>


  		




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	 *


  		




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	 * @param mapCtrl MapControl.


  		




  
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	 * @param mapCtrl the <code>MapControl</code> where is defined the rectangle


  		




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	 */


  		




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	public ZoomInListenerImpl(MapControl mapCtrl) {


  		




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		this.mapCtrl = mapCtrl;


  		




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	}


  		




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	/*


  		




  
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	 * (non-Javadoc)


  		




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	 * @see com.iver.cit.gvsig.fmap.tools.Listeners.RectangleListener#rectangle(com.iver.cit.gvsig.fmap.tools.Events.RectangleEvent)


  		




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	 */


  		




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	public void rectangle(RectangleEvent event) {


  		




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		// mapCtrl.drawMap(false);


  		




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	}


  		




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	/**


  		




  
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	/*


  		




  
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	 * (non-Javadoc)


  		




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	 * @see com.iver.cit.gvsig.fmap.tools.Listeners.ToolListener#getCursor()


  		




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	 */


  		




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	public Cursor getCursor() {


  		




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		return cur;


  		




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	}


  		




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	/**


  		




  
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	/*


  		




  
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	 * (non-Javadoc)


  		




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	 * @see com.iver.cit.gvsig.fmap.tools.Listeners.ToolListener#cancelDrawing()


  		




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	 */


  		




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	public boolean cancelDrawing() {


  		












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